The use of black box cardboard as the main material, the surface of embossed texture processing, do complex sub film processing more exquisite black, black cardboard PH is neutral, green dye, 100% Recyclable processing, no pollution, no color colors on both sides, the middle part of the sandwich color is black, produced by the original goods wood pulp, high stiffness, smooth flatness, packing box made up of very fine.